![](/html/bd/bd52/bd52e6fe36174aba5e36aa9ff2318c3809d47b6adf185888d01b91a68e425a46/bg1.png)
查询SL2150D供应商
SL2150D
Cable Tuner Front End LNA with AGC
Data Sheet
Features
• Single chip dual output LNA
• Wide dynamic range on both channels
• Independent AGC facility incorporated into all
channel paths
• Independent disable facility incorporated into all
channel paths
• Full ESD protection. (Normal ESD handling
procedures should be observed)
Applications
• Multi-tuner cable set top box and cable modem
applications
• Data communications systems
• Terrestrial TV tuner loop though
September 2005
Ordering Information
SL2150D/KG/LH1S 28 Pin QFN Tubes
SL2150D/KG/LH2R 28 Pin QFN* Trays
SL2150D/KG/LH2T 28 Pin QFN* Tape & Reel
*Pb Free Matte Tin
-20°C to +85°C
Description
The SL2150D is a wide dynamic range front end for
tuner applications.
The device offers two buffered outputs from a single
input, where both paths contain an independently
controllable AGC and disable facility.
RFINPUT
RFINPUTB
AGC1 AGC2
AGC
Control
Power
Splitter
AGC
Control
Power Down
DIS1 DIS2
Figure 1 - SL2150D Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2002-2005, Zarlink Semiconductor Inc. All Rights Reserved.
RFOUT1
RFOUT1B
RFOUT2
RFOUT2B
![](/html/bd/bd52/bd52e6fe36174aba5e36aa9ff2318c3809d47b6adf185888d01b91a68e425a46/bg2.png)
SL2150D Data Sheet
Vcc
Vcc
NC#
NC#
NC#
Vcc
Vcc
RFOUT1
RFOUT1B
VEE
(PACKAGE
PADDLE)
Vee
Vee
SL2150D
Vcc
Vcc
Vcc
# Pins marked NC should be connected to Vee
1
Vcc
Vcc
RF INPUT
RF INPUT
Vee
DIS1
DIS2
Vee
Vee
RFOUT2
RFOUT2B
NC#
AGC2
AGC1
LH28
Figure 2 - Pin Allocation
1.0 Quick Reference Data
NB all data applies with differential termination and single ended source both of 75 Ω.
Characteristics Units
RF input operating range 50-860 MHz
Gain with external load as in Figure 11
maximum
minimum
11
-25
Input NF, both paths enabled at maximum gain 6.4 dB
CTB, both paths enabled, all gain settings * -66 dBc
CSO, both paths enabled, all gain settings * -64 dBc
CXM, both paths enabled, all gain settings * -60 dBc
Input impedance 75 Ω
Input VSWR 8 dB
Output impedance differential, all loops
440 Ω
(requires external load for example as in Figure 11)
Input to output isolation (both outputs) 30 dB
Output to output isolation 25 dB
Table 1 - Reference Data
*132 channel matrix at +15 dBmV per channel, 75 Ω source impedance
dB
dB
2
Zarlink Semiconductor Inc.
![](/html/bd/bd52/bd52e6fe36174aba5e36aa9ff2318c3809d47b6adf185888d01b91a68e425a46/bg3.png)
SL2150D Data Sheet
2.0 Functional Description
The SL2150D is a broadband wide dynamic range dual output tuner front en d LNA with AGC. It also has application
is any system where a wide dynamic range broadband power splitter is required.
The pin assignment is contained in Figure 2 and the block diagram in Figure 1.The port internal peripheral circuits
are contained in Figure 14.
In normal application the RF input is interfaced to the device input. The input preamplifier is designed for low noise
figure, within the operating region of 50 to 860 MHz and for high intermodulation distortion intercept so offering
good signal to noise plus composite distortion spurious performance when loaded with a multi carrier system. The
preamplifier also provides an impedance match to a 75 Ω source; the typical impedance is shown in Figure 4.
The input NF is shown in Figure 6.
The output of the preamplifier is then power split to two independently controlled AGC stages. Each AGC stage
provides for a minimum of 30 dB of gain control across the input frequency range. The typical AGC characteristic
and NF versus gain setting are contained in Figure 5 and Figure 7 respectively.
Finally each of the AGC stages drive an output buffer of differential output impedance of 440 Ω, which provides a
nominal 11 dB of gain when terminated into a differential 75 Ω load, as in Figure 11. Each channel AGC and output
buffer can be independently powered down.
In application it is important to avoid saturation of the output stage, therefore it is recommended that the output
standing current be sunk to Vcc through an inductor. A resistive pull up can also be used as shown in Figure 13 "Example Application Driving 100 W Load with Resistive Pull Up", however the resistor values should not exceed
20 ohm single ended.
If an inductive current sink is used the maximum available gain from the device is circa 26 dB. This gain can be
reduced by application of an external load between the differential output ports. The gain can be approximately
calculated from the following formula:
- GAIN = 20*log ((Parallel combination of 440 ohm and external load between ports)/22 ohm)+2 dB
For example when driving a 100 ohm load as in Figure 12, the gain equals
- GAIN = 20 *log ((440 *100)/(440+100)/22)+2 dB =12 dB.
3
Zarlink Semiconductor Inc.
![](/html/bd/bd52/bd52e6fe36174aba5e36aa9ff2318c3809d47b6adf185888d01b91a68e425a46/bg4.png)
SL2150D Data Sheet
F TYPE
RFIN
CH1 S11 1 U FS
PRm
Cor
Avg
16
Smo
Z
0
75
5.1nH
1nF
3
RF INPUT
SL2150D
1nF
4
RF INPUTB
MABAES0029
1:1
Figure 3 - Input Network
4_: 133.23 55.758 10.44 nH
Ω
16 Nov 2001 10:10:47
Ω
850.000 000 MHz
4
Ω
1_: 169.02
-44.117
2_: 49.916
-57.436
250 MHz
3_: 31.238
-5.5576
500 MHz
50 MHz
Ω
Ω
Ω
Ω
Ω
Ω
3
2
START 50.000 000 MHz STOP 850.000 000 MHz
1
Figure 4 - Typical Single-end Input Impedance
4
Zarlink Semiconductor Inc.
![](/html/bd/bd52/bd52e6fe36174aba5e36aa9ff2318c3809d47b6adf185888d01b91a68e425a46/bg5.png)
SL2150D Data Sheet
Typical AGC vs Control Voltage
15
5
-5
-15
-25
Gain (dB)
-35
-45
-55
-65
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
Figure 5 - Typical AGC Characteristic
AGC Voltage (V)
Typical Noise Figure vs Frequency (Vagc = 3 V, Maximum Gain)
9
8.5
8
7.5
7
6.5
NF(dB)
6
5.5
5
4.5
4
50 150 250 350 450 550 650 750 850
Frequency (MHz)
Figure 6 - Input Noise Figure at 25°C
5
Zarlink Semiconductor Inc.